Spotify's offline limits have been one of the bigger sticking points for Premium users. While Spotify's 10,000 song library limit takes a while to reach, the 3-device, 3,333 song limit for Spotify's offline content has been quite easy for users to hit, especially if they subscribe to any huge community playlists. Well, after years of persistent user complaints, Spotify is upgrading its offline limits to 10,000 songs on up to 5 devices. A Spotify spokesperson confirmed to Rolling Stone:
At Spotify, we're always working on improving the experience for our users. We can now confirm that we have increased the number of offline tracks per device — from 3,333 on three devices to 10,000 tracks per device for up to five devices.
Being able to use more devices with Spotify's offline content is great news, but the fact that you'll be able to download your entire library on a single device is even better, since most users only use one phone at a time, and want to be able to access all of their music offline rather than just a third of it.
Source : https://www.androidcentral.com/spotify